|Satellite Vibration on Image Quality Degradation of Remote Sensing Camera|
Vibration is one of the important factors affecting the image quality of remote sensing camera for disturbing pixel-matched storage and causing image motion. Analyzing the influence of satellite vibration on the image quality degradation of remote sensing camera will be of great importance in compensating image motion and putting forward the satellite controlling index. Modulation transfer function (MTF) is a major index to evaluate the image quality of optical image system...
Keywords: Vibration; MTF; Two-dimensional space; Statistical moment
|A numerical study of fluid flow around two-dimensional lifting surfaces - Dannecker, John D|
Keywords: COMPUTATIONAL FLUID DYNAMICS; TWO DIMENSIONAL FLOW; LIFTING SURFACES
|Properties of Vector Preisach Models - Kahler, Gary R.|
This paper discusses rotational anisotropy and rotational accommodation of magnetic particle tape. These effects have a performance impact during the reading and writing of the recording process. We introduce the reduced vector model as the basis for the computations. Rotational magnetization models must accurately compute the anisotropic characteristics of ellipsoidally magnetizable media. An ellipticity factor is derived for these media that computes the two-dimensional magnetization trajector...
Keywords: VENUS ATMOSPHERE; ASTEROIDS; TWO DIMENSIONAL MODELS; IMPACT VELOCITY; CRATERING
|Spot weld analysis with 2D ultrasonic Arrays (Volume 109) - Denisov, A.A.|
Journal of Research of the National Institute of Standards and Technology
Keywords: ultrasonic; least-squares; nondestructive analysis; transducer; two-dimensional
|Calculation of the base pressure in two- dimensional supersonic flows - Gogish, L. V.|
Approximation method for calculating base pressure in two-dimensional supersonic flows
Keywords: APPROXIMATION; BASE PRESSURE; ISENTROPIC PROCESSES; SUPERSONIC FLOW; TWO DIMENSIONAL FLOW; APPROXIMATION METHOD; BASE PRESSURE; SUPERSONIC FLOW; TWO-DIMENSIONAL FLOW
|PERFORMANCE OF VARIABLE TWO-DIMENSIONAL INLET DESIGNED FOR ENGINE-INLET MATCHING. I - PERFORMANCE AT DESIGN MACH NUMBER OF 3.07 - Beheim, M. A.|
Supersonic performance of variable two-dimensional inlets designed for engine-inlet matching
Keywords: BYPASSES; SUPERSONIC INLET; TWO-DIMENSIONAL BODY; VARIABLE GEOMETRY STRUCTURE; COWLINGS; ENGINES; ISENTROPE; MACH NUMBER; SUPERSONIC INLETS; TWO DIMENSIONAL BODIES; VARIABLE GEOMETRY STRUCTURES; ENGINE
|Two-dimensional unsteady flow in a traveling wave plasma accelerator - Peyret, R|
Two-dimensional unsteady flow in traveling wave plasma accelerator studied using small perturbation theory
Keywords: LAPLACE TRANSFORMATION; TWO-DIMENSIONAL FLOW; UNSTEADY FLOW; PERTURBATION THEORY; PLASMA ACCELERATORS; TRAVELING WAVES; TWO DIMENSIONAL FLOW; UNSTEADY FLOW; PERTURBATION THEORY; PLASMA ACCELERATOR; TRAVELING WAVE
|Supersonic gas flow around blunt bodies - Theoretical and experimental investigations - Belotserkovskiy, O. M|
Supersonic gas flow around blunt bodies, and numerical algorithms constructed for calculating two-dimensional and three-dimensional bodies of various shapes
Keywords: ALGORITHMS; BLUNT BODY; NUMERICAL ANALYSIS; SUPERSONIC FLOW; TWO-DIMENSIONAL BODY; BLUNT BODIES; DIMENSIONS; GAS FLOW; NUMERICAL ANALYSIS; SHAPES; SUPERSONIC FLOW; THREE DIMENSIONAL BODIES; TWO DIMENSIONAL BODIES
|Rotational apparent mass by electrical analogy - Andrew, G. M.|
Electrical analogy technique for determining rotational apparent masses of body in two- dimensional fluid flow
Keywords: ANALOGIES; RESISTANCE DEVICE; ROTARY STABILITY; TWO-DIMENSIONAL FLOW; BODY FLUIDS; ELECTRICAL RESISTANCE; FLUID FLOW; MASS; ROTARY STABILITY; TWO DIMENSIONAL FLOW; ELECTRIC RESISTANCE; MASS
|Aspect Ratio - November 2012|
John Morrison interview Jasminka Bijelic Ljubic about her amateur children's filmmaking school, SAF, in Croatia.
Keywords: animation; california film institute; bay area; independent; two-dimensional; clay-mation; stop-motion; submarine
|On the flow of a conducting fluid around a magnetized body - Kulikovskii, A. G|
No Abstract Available
Keywords: REATTACHED FLOW; SUPERSONIC FLOW; TWO DIMENSIONAL FLOW; BACKWARD FACING STEPS; BOUNDARY LAYERS; SEPARATED FLOW
|Optimum forms of bodies with associated shock waves - Shipilin, A. V|
Optimum form of two-dimensional and axisymmetric bodies in supersonic ideal gas flow with associated shock waves
Keywords: AXISYMMETRIC BODIES; GAS FLOW; IDEAL GAS; SHOCK WAVES; SUPERSONIC FLOW; SYMMETRY; TWO DIMENSIONAL BODIES
|A Flight Investigation to Determine the Lateral Oscillatory Damping Acceptable for an Airplane in the Landing Approach - McNeill, Walter E.|
An F-86E airplane, in which servo actuation of the ailerons and rudder provides artificial variation of the important lateral and directional aerodynamic stability parameters, has been flown by test pilots of the NASA, U.S. Air Force, and one aircraft manufacturer to determine satisfactory and acceptable levels of lateral oscillatory damping in the landing approach. In addition to normal operational use, particular consideration was given to the emergency condition of failure of stability-augmen...
Keywords: TEMPERATURE DISTRIBUTION; TWO DIMENSIONAL FLOW; COOLING; UNSTEADY FLOW; BLUFF BODIES; WAKES; POTENTIAL FLOW; COMPRESSIBLE FLOW
|Variability of Winter Air Temperature in Mid-Latitude Europe - Otterman, J.|
The aim of this paper is to report extreme winter/early-spring air temperature (hereinafter temperature) anomalies in mid-latitude Europe, and to discuss the underlying forcing to these interannual fluctuations. Warm advection from the North Atlantic in late winter controls the surface-air temperature, as indicated by the substantial correlation between the speed of the surface southwesterlies over the eastern North Atlantic (quantified by a specific Index Ina) and the 2-meter level air temperat...
Keywords: COMPUTATIONAL FLUID DYNAMICS; TEXTURES; THREE DIMENSIONAL MODELS; FLOW VISUALIZATION; FLOW DISTRIBUTION; TWO DIMENSIONAL MODELS; ADVECTION
|ON LIGHTNING PROTECTION WITH A REMOTE LIGHTNING ROD - WALTER, B|
DISADVANTAGES OF THE PRESENT TYPE OF LIGHTNING PROTECTION ARE DISCUSSED. IT IS CONCLUDED FROM TESTS AND LIGHTNING STATISTICS THAT LIGHTNING RODS WHICH ARE SEPARATE FROM THE BUILDING TO BE PROTECTED OFFER THE BEST PROTECTION.
Keywords: EQUATIONS OF MOTION; FLOW EQUATIONS; NOZZLE FLOW; TWO DIMENSIONAL FLOW; AXISYMMETRIC FLOW; FLOW THEORY; NUMERICAL ANALYSIS
|HUMAN-LIKE MACHINES - DROEGE, K|
APPLICATIONS OF TELEOPERATOR MACHINES (REMOTE MANIPULATORS) AND ROBOTS IN VARIOUS AREAS OF TECHNOLOGY ARE DESCRIBED. THE SYNTELMANN TELEOPERATOR IS DISCUSSED IN DETAIL.
Keywords: PRESSURE DISTRIBUTION; TRANSONIC WIND TUNNELS; TWO DIMENSIONAL FLOW; WIND TUNNEL WALLS; AERODYNAMIC FORCES; AIRFOILS; SUBSONIC SPEED
|Contributions of microgravity test results to the design of spacecraft fire safety systems - Friedman, Robert|
Experiments conducted in spacecraft and drop towers show that thin-sheet materials have reduced flammability ranges and flame-spread rates under quiescent low-gravity environments (microgravity) as compared to normal gravity. Furthermore, low-gravity flames may be suppressed more easily by atmospheric dilution or decreasing atmospheric total pressure than their normal-gravity counterparts. The addition of a ventilating air flow to the low-gravity flame zone, however, can greatly enhance the flam...
Keywords: ATTITUDE (INCLINATION); EUCLIDEAN GEOMETRY; ORBIT CALCULATION; QUATERNIONS; ATTITUDE INDICATORS; SATELLITE ATTITUDE CONTROL; TWO DIMENSIONAL MODELS
|Precision tests of quantum hall effect device DC equivalent circuit using double-series and triple-series connections (Volume 100) - Jeffery, A.|
Journal of Research of the National Institute of Standards and Technology
Keywords: de quantum Hall effect; ac quantum Hall effect; cryogenic current comparator; two-dimensional electron gas
|On the Prandtl integro-differential equation - Vekua, I. N|
No Abstract Available
Keywords: COMPRESSIBLE FLOW; FLEXIBILITY; TWO DIMENSIONAL FLOW; WALL FLOW; ADAPTIVE CONTROL; INTERFERENCE; WIND TUNNELS
|Electric arc welding Patent - Mccaig, J. C.|
Controlled arc spot welding method
Keywords: COMPRESSIBLE FLOW; FLOW EQUATIONS; LAMINAR BOUNDARY LAYER; SUCTION; APPROXIMATION; GAS FLOW; SURFACE TEMPERATURE; TWO DIMENSIONAL FLOW
|Observation and an explanation of breakdown of the quantum Hall effect (Volume 95) - Cage, M.E.|
Journal of Research of the National Institute of Standards and Technology
Keywords: inter-Landau level scattering; acoustic phonon; breakdown of the dissipationless state; two-dimensional electron gas
|Medical Information Management System (MIMS): An automated hospital information system - Alterescu, S.|
An automated hospital information system that handles all data related to patient-care activities is described. The description is designed to serve as a manual for potential users, nontechnical medical personnel who may use the system. Examples of the system's operation, commentary on the examples, and a complete listing of the system program are included.
Keywords: INLET PRESSURE; INTAKE SYSTEMS; COMPRESSION LOADS; INTERNAL PRESSURE; TWO DIMENSIONAL FLOW
|Using Technology Readiness Level (TRL), Life Cycle Cost (LCC), and Other Metrics to Supplement Equivalent System Mass (ESM) in Advanced Life Support (ALS) - Jones, Harr|
The ALS project plan goals are reducing cost, improving performance, and achieving flight readiness. ALS selects projects to advance the mission readiness of low cost, high performance technologies. The role of metrics is to help select good projects and report progress. The Equivalent Mass (EM) of a system is the sum of the estimated mass of the hardware, of its required materials and spares, and of the pressurized volume, power supply, and cooling system needed to support the hardware in space...
Keywords: AERODYNAMIC FORCES; CASCADE FLOW; UNSTEADY AERODYNAMICS; TURBOMACHINE BLADES; VIBRATION; LIFT; VORTICES; TRAILING EDGES; TWO DIMENSIONAL FLOW
|Project Vanguard Magnetic-Field Instrumentation and Measurements - Heppner, J. P.|
The Vanguard III Satellite, 1959 Eta, placed in orbit on September 18, 1959, contained a proton precessional magnetometer for magnetic-field studies of exceptional accuracy. Throughout the 85 days of battery life, the instrumentation functioned according to plan. Measurements of the absolute total field were obtained in the meridian belts of Minitrack stations at altitudes 510 to 3750 kilometers and at latitudes /- 33.4 degrees...
Keywords: TWO DIMENSIONAL FLOW; SUPERSONIC FLOW; HEATING; THIN WINGS; PROPULSION; AIRCRAFT PERFORMANCE; PROPULSIVE EFFICIENCY; PROPULSION SYSTEM PERFORMANCE
|Flight Test Techniques Used to Evaluate Performance Benefits During Formation Flight - Ray, Ronald J.|
The Autonomous Formation Flight research project has been implemented at the NASA Dryden Flight Research Center to demonstrate the benefits of formation flight and develop advanced technologies to facilitate exploiting these benefits. Two F/A-18 aircraft have been modified to precisely control and monitor relative position, and to determine performance of the trailing airplane. Flight test maneuvers and analysis techniques have been developed to determine the performance advantages, including dr...
Keywords: TURBULENT JETS; VORTICES; TWO DIMENSIONAL JETS; AIR JETS; CROSS FLOW; WALLS; MOMENTUM; SMOKE; SPACING; TRAJECTORIES
|Space programs summary no. 37-63, volume 1 for the period 1 March - 30 April 1970. Flight projects - NON|
Mariner Mars 1971, Mariner Venus-Mercury 1973 and Viking Orbiter 1975 status reports
Keywords: ELLIPSOIDS; PRESSURE DISTRIBUTION; SUPERSONIC SPEED; ANGLE OF ATTACK; CONES; SHOCK WAVES; TWO DIMENSIONAL FLOW
|The effects of overmaturity on eggs of Rana temporaria - Eidmann, H|
Overmaturity effect on sex ratio and cytoplasm of frog eggs
Keywords: CIRCULAR CYLINDERS; REYNOLDS NUMBER; STROUHAL NUMBER; TWO DIMENSIONAL FLOW; SMOKE; VORTICES; WAKES
|Tectonic Processes on Planets and Satellites - Head, J. W|
The final report is comprised of 7 journal articles that were completed during the reporting period. Topics covered include:(1) photogeologic analysis of the Magellan stereo view of six coronae; (2) the ancient age of Maxwell Montes; (3) timescale of regional plains emplacement on Venus; (4) remote and local stresses and calderas on Mars; (5) lunar linear rilles; (6) stratigraphical constraints on the duration of tessera formation on Venus; and (7) the use of magnetic signatures in identifying s...
Keywords: SILICON; MICROMACHINING; MANAGEMENT SYSTEMS; TECHNOLOGIES; THREE DIMENSIONAL MODELS; SINGLE CRYSTALS; ELECTROMECHANICAL DEVICES; TWO DIMENSIONAL MODELS
|Skylab: Illustrated chronology, 1962-1973 - Akens, David S|
No Abstract Available
Keywords: ATMOSPHERIC CHEMISTRY; ATMOSPHERIC MODELS; DIFFERENTIAL EQUATIONS; STRATOSPHERE; TWO DIMENSIONAL MODELS; CARBON 14; KINETICS; METHANE; NITROGEN OXIDES
|Microgravity Manufacturing Via Fused Deposition - Cooper, K. G.|
Manufacturing polymer hardware during space flight is currently outside the state of the art. A process called fused deposition modeling (FDM) can make this approach a reality by producing net-shaped components of polymer materials directly from a CAE model. FDM is a rapid prototyping process developed by Stratasys, Inc.. which deposits a fine line of semi-molten polymer onto a substrate while moving via computer control to form the cross-sectional shape of the part it is building...
Keywords: AERODYNAMIC CHARACTERISTICS; TURBOCOMPRESSORS; ROTORS; COMPRESSOR BLADES; NAVIER-STOKES EQUATION; INLET PRESSURE; TWO DIMENSIONAL MODELS
|On the question of efficient extraction of electrons from a plasma in a vacuum - Kreyndel, Yu. YE., et al|
Efficient electron extraction from plasmas in vacuum
Keywords: AERODYNAMIC COEFFICIENTS; TABS (CONTROL SURFACES); UNSTEADY FLOW; MATHEMATICAL MODELS; MATRICES (MATHEMATICS); SUBSONIC FLOW; TWO DIMENSIONAL FLOW
|Solar cell radiation handbook - Tada, H. Y.|
Solar cell theory cells are manufactured, and how they are modeled mathematically is reviewed. The interaction of energetic charged particle radiation with solar cells is discussed in detail and the concept of 1 MeV equivalent electron fluence is introduced. The space radiation environment is described and methods of calculating equivalent fluences for the space environment are developed. A computer program was written to perform the equivalent fluence calculations and a FORTRAN listing of the p...
Keywords: DIGITAL COMPUTERS; GATES (CIRCUITS); RADIATION; ARRAYS; ELECTROLUMINESCENCE; PARALLEL COMPUTERS; SIGNAL PROCESSING; TWO DIMENSIONAL BODIES
|Validation of GOES-9 Satellite-Derived Cloud Properties over the Tropical Western Pacific Region - Khaiyer, Mandana M.|
Real-time processing of hourly GOES-9 images in the ARM TWP region began operationally in October 2003 and is continuing. The ARM sites provide an excellent source for validating this new satellitederived cloud and radiation property dataset. Derived cloud amounts, heights, and broadband shortwave fluxes are compared with similar quantities derived from ground-based instrumentation. The results will provide guidance for estimating uncertainties in the GOES-9 products and to develop improvements ...
Keywords: MICROSCOPY; NEAR FIELDS; SIGNAL PROCESSING; SCATTERING; TWO DIMENSIONAL BODIES; FAR FIELDS; RANDOM NOISE
|Exploration of Anomalous Gravity Effects by rf-Pumped Magnetized High-T(c) Superconducting Oxides - Robertson, Tony|
A number of anomalous gravitational effects have been reported in the scientific literature during recent years, but there has been no independent confirmation with regard to any of these claims. Therefore, the NASA Marshall Space Flight Center, in response to the propulsion challenges specified by NASA's Breakthrough Propulsion Physics (BPP) program, proposed to explore the possibility of observing anomalous gravitation behavior through the manipulation of Josephson junction effects in magnetiz...
Keywords: UPWELLING WATER; TWO DIMENSIONAL MODELS; TROPOSPHERE; WAVE DRAG; VORTICES; TROPICAL REGIONS; STRATOSPHERE; VISCOSITY; ANGULAR MOMENTUM
|Helicopter roll control effectiveness criteria program summary - Heffley, Robert K.|
A study of helicopter roll control effectiveness is summarized for the purpose of defining military helicopter handling qualities requirements. The study is based on an analysis of pilot-in-the-loop task performance of several basic maneuvers. This is extended by a series of piloted simulations using the NASA Ames Vertical Motion Simulator and selected flight data. The main results cover roll control power and short-term response characteristics...
Keywords: AIR JETS; FLOW STABILITY; MESH; RODS; TWO DIMENSIONAL FLOW; MOMENTUM TRANSFER; TEMPERATURE DISTRIBUTION; TURBULENT FLOW
|Automatic determination of fault effects on aircraft functionality - Feyock, Stefa|
The problem of determining the behavior of physical systems subsequent to the occurrence of malfunctions is discussed. It is established that while it was reasonable to assume that the most important fault behavior modes of primitive components and simple subsystems could be known and predicted, interactions within composite systems reached levels of complexity that precluded the use of traditional rule-based expert system techniques...
Keywords: COMPRESSIBLE FLOW; EQUATIONS OF MOTION; FLOW EQUATIONS; BERNOULLI THEOREM; CONTINUITY EQUATION; FLOW DISTRIBUTION; THERMODYNAMICS; TRANSFORMATIONS (MATHEMATICS); TWO DIMENSIONAL FLOW
|A robot control formalism based on an information quality concept - Ekman, A.|
A relevance measure based on Jaynes maximum entropy principle is introduced. Information quality is the conjunction of accuracy and relevance. The formalism based on information quality is developed for one-agent applications. The robot requires a well defined working environment where properties of each object must be accurately specified.
Keywords: COMBUSTION; ALTITUDE; PLANETARY BOUNDARY LAYER; FOSSIL FUELS; NITRIC ACID; POLLUTION; STRATOSPHERE; TEMPERATE REGIONS; TROPOSPHERE; TURBULENT DIFFUSION; TWO DIMENSIONAL MODELS
|Science Requirements for a Space Flight Experiment entitled CRITICAL VISCOSITY OF XENON - Berg, Robert F.|
We propose to measure in low gravity the viscosity of xenon close to its critical point. The accuracy will be sufficient to eliminate uncertainties currently associated with the analysis of l-g experiments. The measurements will provide the first direct observation of the predicted power-law divergence of viscosity in a pure fluid. The measurements will also strengthen Zeno's test of mode coupling theory by greatly increasing the reliability of the extrapolation of viscosity to low reduced tempe...
Keywords: GAS JETS; GAS FLOW; TWO DIMENSIONAL FLOW; FLOW EQUATIONS; CONVERGENCE; DIFFERENTIAL EQUATIONS; INTEGRALS; INDEPENDENT VARIABLES; FLOW VELOCITY
|Fractal Characterization of Multitemporal Remote Sensing Data - Quattrochi, Dale A.|
Scale is an ''innate'' concept in geographic information systems. It is recognized as something that is intrinsic to the capture, storage, manipulation, analysis, modeling, and output of space and time data within a GIS purview, yet the relative meaning and ramifications of scaling spatial and temporal data from this perspective remain enigmatic. As GISs become more sophisticated as a product of more robust software and more powerful computer systems, there is an urgent need to examine the issue...
Keywords: ROBUSTNESS (MATHEMATICS); COMPONENT RELIABILITY; STRUCTURAL ANALYSIS; ALGORITHMS; TWO DIMENSIONAL MODELS; COMPUTERIZED SIMULATION; FORMULATIONS; FREQUENCIES; DAMPING; DYNAMIC MODELS; DYNAMIC CONTROL
|Closed Loop Active Flow Separation Detection and Control in a Multistage Compressor - Bright, Michelle M.|
Active closed loop flow control was successfully demonstrated on a full annulus of stator vanes in a low speed axial compressor. Two independent methods of detecting separated flow conditions on the vane suction surface were developed. The first technique detects changes in static pressure along the vane suction surface, while the second method monitors variation in the potential field of the downstream rotor...
Keywords: GAMMA RAY BURSTS; GALAXIES; ATMOSPHERIC MODELS; EARTH ATMOSPHERE; EXTRAPOLATION; OZONE DEPLETION; EXOBIOLOGY; TWO DIMENSIONAL MODELS; ORGANISMS; IRRADIATION
|Remote Imaging Applied to Schistosomiasis Control: The Anning River Project - Seto, Edmund Y. W.|
The use of satellite imaging to remotely detect areas of high risk for transmission of infectious disease is an appealing prospect for large-scale monitoring of these diseases. The detection of large-scale environmental determinants of disease risk, often called landscape epidemiology, has been motivated by several authors (Pavlovsky 1966; Meade et al. 1988). The basic notion is that large-scale factors such as population density, air temperature, hydrological conditions, soil type, and vegetati...
Keywords: MONTE CARLO METHOD; PHOTOCHEMICAL REACTIONS; STRATOSPHERE; TOTAL OZONE MAPPING SPECTROMETER; TWO DIMENSIONAL MODELS; OZONE; REGRESSION ANALYSIS; TEMPERATE REGIONS; VAPOR PHASES
|Effects of the labyrinths on the cervical muscle tonus - Stepanova, S. I|
Labyrinths effect on cervical muscle tonus
Keywords: SOLID PROPELLANT ROCKET ENGINES; STRESS ANALYSIS; VISCOELASTICITY; COMPUTER PROGRAMS; POISSON RATIO; STRESS-STRAIN DIAGRAMS; THREE DIMENSIONAL FLOW; TWO DIMENSIONAL FLOW
|Evaluation and prediction of long-term space environmental effects on nonmetallic materials - Geisendorfer, R. F|
No Abstract Available
Keywords: AIRFOILS; DROPS (LIQUIDS); IMPINGEMENT; TWO DIMENSIONAL BODIES; ANGLE OF ATTACK; CLOUDS (METEOROLOGY); DROP SIZE; ICE FORMATION; SIZE DETERMINATION
|A study of the possible use of thrust vector rotation for 'cutoff' for ballistic missiles - Boksembom, A. S.|
No Abstract Available
Keywords: NOSES (FOREBODIES); SHOCK ABSORBERS; SUPERSONIC SPEED; WIND TUNNEL MODELS; GRAPHS (CHARTS); THREE DIMENSIONAL FLOW; TWO DIMENSIONAL FLOW
|One-Dimensional Coupled Ecosystem-Carbon Flux Model for the Simulation of Biogeochemical Parameters at Ocean Weather Station P - Signorini, S.|
In this Technical Publication, we describe the model functionality and analyze its application to the seasonal and interannual variations of phytoplankton, nutrients, pCO2 and CO2 concentrations in the eastern subarctic Pacific at Ocean Weather Station P (OWSP, 50 deg. N 145 deg. W). We use a verified one-dimensional ecosystem model, coupled with newly incorporated carbon flux and carbon chemistry components, to simulate 22 years (1958-1980) of pCO2 and CO2 variability at Ocean Weather Station P...
Keywords: AERODYNAMIC CHARACTERISTICS; VENTING; ASYMMETRY; HELICOPTERS; STRAKES; AERODYNAMIC CONFIGURATIONS; TWO DIMENSIONAL MODELS; TAIL ASSEMBLIES; CROSS FLOW; FLIGHT CONDITIONS; WIND DIRECTION
|Quantification of Inlet Impedance Concept and a Study of the Rayleigh Formula for Noise Radiation from Ducted Fan Engines - Posey, Joe W.|
This paper addresses two aspects of duct propagation and radiation which can contribute to more efficient fan noise predictions. First, we assess the effectiveness of Rayleigh's formula as a ducted fan noise prediction tool. This classical result which predicts the sound produced by a piston in a flanged duct is expanded to include the uniform axial inflow case. Radiation patterns using Rayleigh's formula with single radial mode input are compared to those obtained from the more precise ducted f...
Keywords: WOVEN COMPOSITES; TWO DIMENSIONAL MODELS; THREE DIMENSIONAL MODELS; DEBONDING (MATERIALS); DELAMINATING; CRACK CLOSURE; TEXTILES; PLATES (STRUCTURAL MEMBERS)
|Lateral and Drag Forces on Misaligned Cylindrical Rollers - Mcginness, H|
Formulas are presented for estimating the drag and lateral forces on misaligned cylindrical rollers. A formula for the lateral force coefficient of a misaligned cylindrical roller on a flat track was made up. Reasonable values for the sliding coefficient of friction micro and for the rolling drag coefficient f when inserted into the formula produce values which are in in agreement with the lateral force test results...
Keywords: COMPRESSIBLE FLOW; TIME DEPENDENCE; TURBULENT FLOW; TWO DIMENSIONAL FLOW; COMPUTER PROGRAMS; IDEAL GAS; INVISCID FLOW; NAVIER-STOKES EQUATION; REYNOLDS NUMBER
|NASA aviation safety reporting system - NON|
The human factors frequency considered a cause of or contributor to hazardous events onboard air carriers are examined with emphasis on distractions. Safety reports that have been analyzed, processed, and entered into the aviation safety reporting system data base are discussed. A sampling of alert bulletins and responses to them is also presented.
Keywords: POTENTIAL FLOW; POTENTIAL THEORY; TWO DIMENSIONAL FLOW; WING PROFILES; FLOW DISTRIBUTION; INTEGRAL EQUATIONS; KUTTA-JOUKOWSKI CONDITION; TRANSFORMATIONS (MATHEMATICS); VELOCITY DISTRIBUTION
|Optical photometry of the 1982-1984 eclipse of Epsilon Aurigae - Hopkins, J. L|
From slightly before the 1982-1984 eclipse of Epsilon Aurigae to the present observers from around the world have been making photoelectric photometry observations of this star system. Over 2000 UBV observations have been reported as well as observations in the R, I, J, H, K, L, M, N, and Q bandpasses plus the y, b, v, and u bandpasses. Twenty nine observers from 9 countries submitted photometry data to the campaign...
Keywords: FLOW VISUALIZATION; LASER APPLICATIONS; TWO DIMENSIONAL FLOW; WATER TUNNEL TESTS; FLOW DISTRIBUTION; FLUORESCENCE; LASER OUTPUTS; PARTICULATES; PHOTOGRAPHY
|A Human Factors Evaluation of a Methodology for Pressurized Crew Module Acceptability for Zero-Gravity Ingress of Spacecraft - Sanchez, Merri J|
This project aimed to develop a methodology for evaluating performance and acceptability characteristics of the pressurized crew module volume suitability for zero-gravity (g) ingress of a spacecraft and to evaluate the operational acceptability of the NASA crew return vehicle (CRV) for zero-g ingress of astronaut crew, volume for crew tasks, and general crew module and seat layout. No standard or methodology has been established for evaluating volume acceptability in human spaceflight vehicles...
Keywords: SHIELDING; HELMHOLTZ VORTICITY EQUATION; ACTIVE CONTROL; NOISE REDUCTION; CONTROL SURFACES; ANISOTROPY; OPTIMIZATION; BESSEL FUNCTIONS; SOUND FIELDS; TWO DIMENSIONAL MODELS